Can someone explain how this differs from the non-pwm version? Is it just the number of wires? IF so why would one select that over the alternative?

PWM or pulse width modulation is one of several methods to control motor and hence in this case fan speed. The correct motherboard connection as noted below permits the fan speed to be modulated to increase cooling when computing loads are high and slowing the fan at other times. The only benefit being less fan noise.

Can this be mounted in place of a 50x50mm fan?

No, not unless you have room for it and can enlarge the mounting hole pattern and fan hole.

Can you convert this from 4 pin to 2 pin?

It comes with PWM to three pin adapters.... You'd have to hack up your own PWM to DC adapter

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Noctua NF-A6x25 PWM, Premium Quiet Fan, 4-Pin (60mm, Brown)

Noctua NF-A6x25 PWM, Premium Quiet Fan, 4-Pin (60mm, Brown)

Product ID: 14165352

Details

Air Flow Capacity
29.2 cubic per
Brand
Noctua
Compatible Devices
Desktop
Cooling Method
Air
Material
Fibre-glass
Maximum Rotational Speed
3000 rpm

⏳>150,000 hours MTTF reliability

🌀3000 RPM max speed

🔇Ultra-quiet 19.3 dB(A)

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Description

🌀 Silence Meets Power: Cool Smarter, Not Louder

COMPACT YET POWERFUL - 60x60x25 mm size fits tight spaces without compromising airflow of 29.2 m³/h.
PRECISION PWM CONTROL - Seamlessly adjust fan speed from 550 to 3000 RPM for tailored cooling and energy efficiency.
WHISPER QUIET COOLING - Experience near-silent airflow with advanced acoustic optimization, perfect for focused work or gaming marathons.
PLUG PLAY VERSATILITY - 4-pin PWM connector with extension and y-cables for easy integration and dual fan setups.
VIBRATION FREE OPERATION - Includes anti-vibration mounts to keep your setup stable and noise-free.

The Noctua NF-A6x25 PWM is a premium 60mm computer fan engineered for ultra-quiet, high-performance cooling. Featuring a 4-pin PWM interface for dynamic speed control up to 3000 RPM, it delivers 29.2 m³/h airflow while maintaining a whisper-quiet 19.3 dB(A) noise level. Built with durable fibre-glass reinforced PBT and backed by a 6-year warranty, it’s the ideal upgrade for compact devices like NAS, DVRs, and 3D printers seeking reliable, vibration-free cooling.

Specifications

ASIN	B00VXTANZ4
Air Flow Capacity	29.2 cubic meter per hour
Best Sellers Rank	#103 in Computer Case Fans
Brand Name	Noctua
Compatible Devices	Desktop
Cooling Method	Air
Customer Reviews	4.8 4.8 out of 5 stars (2,697)
Global Trade Identification Number	00842431012524, 04716123315636
Item Dimensions L x W x H	2.36"L x 2.36"W x 0.98"H
Item Weight	41 g
Manufacturer	Noctua
Material Type	Fibre-glass reinforced PBT
Maximum Rotational Speed	3000 rpm
Model	NF-A6x25 PWM
Noise Level	19.3 db
Number of Items	1
Part Number	NF-A6x25 PWM
Power Connector Type	4-Pin
UPC	842431012524
Unit Count	1 Count
Voltage	12 volts
Warranty Description	6 year manufacturer’s warranty

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€ 40.27

Duties & taxes included

In stock

Sold byAmazon AustriaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Austria.

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TrustScore 4.5 | 7,300+ reviews

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